Production of anthraquinone derivatives



Patented Feb. 2%, 1934 barren at .ss

Parser at ics PEODUCTEON OF ANTHRAQUENONE DERIVATEVES Paul Nawiasky and Artur Krause, Ludwigshaien on the Rhine, and Eertholcl Stein,

Mannheim,

Germany,

assigncrs to General Aniline Works, Ina, New York, N. Y., a corporation of Delaware No Drawing.

Application April 24, 1931, Serial No. 532,696, and in Germany May 3, 1930 8 Claims.

(H) NEH! in which R1 is hydrogen, alkyl or a sulphonated or non-sulphonated aryl radicle, with solutions in monohydric alcohols of alkali metals or alkali metal hydroxides.

We have now found that valuable derivatives of 1.4-diaminoanthraquinone are obtained by treating 1aminol-arylsulphamido-anthraquinone-2-sulphonic acids with dilute alkali metal alcoholates, i. e. solutions in monoor polyhydrie alcohols of alkali metals or alkali metal hydroxides. Generally speaking the l-amino-darylsulphamido 2 alkoxyanthraquinones a r e formed as the final products, so that no saponification of the acyl group takes place. The reaction is usually carried out at temperatures between. and 120 C. preferably between 70 and 100 C. The alcohols are preferably chosen from the lower members of the aliphatic series. The resulting acyl derivatives are valuable initial terials for the manufacture of dyestufis but may also be used as dyestuffs themselves.

The following examples will further illustrate how this invention may be carried out in practice, but the invention is not restricted to these examples. The parts are by weight.

Example 1 10 parts of 1-amino-s-para-toluenesulphamidoanthraquinone-2-sulphonic acid (obtainable for by suction and washing. The resulting condensation product is 1-amino-2-methoXy-4-paratoluenesulphamicloanthraquinone which forms bluish-red crystalline needles and dissolves in alcohol giving a scarlet colouration. When caustic soda is added the colour changes to violet with the formation of the sulphamide sodium salt. When the resulting compound is dissolved in concentrated sulphuric acid the toluenesulphonic acid radicle is split off. By adding water to the sulphuric acid solution very pure 1.4-diamino-2- methoxyanthraquinone is obtained.

Example 2 10 parts of 1-amino4-para-toluenesulphamidoanthraquinone-2-sulphonic acid are introduced at 80 C. into a melt obtained by dissolving 30 parts of caustic potash in parts of ethylene glycol and the whole is further treated at the same temperature until initial material can no longer be detected in a sample Withdrawn and worked up. Th melt is worked up as described in Example 1. The resultingcondensation product is, according to its properties, the 2-monoglyco1- ether of 1-amino--para-toluenesulphainidoanthraquincne. It may be crystallized from dilute acetic acid and is then obtained in the form of red crystals having a melting point of from 197 to 199 C.

What we claim is:

1. The process for the production of anthraquinone derivatives which comprises heating 1- amino-e p-toluenesulphamido anthraquinone- 2-sulphonic acid with a dilute alkali metal alcoholate.

2. The process for the production of anthrauinone derivatives which comprises heating 1- amino-4 p-toluenesulphamido anthraquinone- 2-sulphonic acid with caustic potash in methyl alcohol.

3. The process for the production of anthraquinone derivatives which comprises heating 1- aminoi p-toluenesulphamido anthraquinone- Z-sulphonic acid with caustic potash in ethylene glycol. 5

The process for the production of anthraquinone derivatives which comprises heating an 1 amino=l-X-sulphamido-anthraquinone-2-sulphonic acid in which X stands for a radical of the benzene series with a dilute alkali metal alcoholate.

5. 1 amino 4 X sulphamido-2-alkoxy-anthraquinones in which X stands for a radical of the benzene series.

6. l-amino el-p-toluenesulphamido-2-alkoxyanthraquinones.

5 radicle of the benzene series with a dilute alkali metal alcoholate.

8. l-amino-2-a1koxyanthraquinones containing in the 4-position an arylsulphamido radicle of the-benzene series.

PAUL NAWIASKY. ARTUR KRAUSE. BERTI-IOLD STEIN. 

